package com.sample.aa.graf_v25;

import java.util.ArrayList;

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.View;

@TargetApi(14)
public class Board extends View implements SurfaceHolder.Callback {

	private static final float TOUCH_TOLERANCE = 4;

	private Bitmap mBitmap;
	private Canvas mCanvas;
	private Path mPath;
	private Paint mBitmapPaint;
	private Paint mPaint;
	private int color;
	private ArrayList<PointsToPaint> pointsList;

	public Board(Context c) {
		super(c);

		pointsList = new ArrayList<PointsToPaint>();

		mPath = new Path();
		mBitmapPaint = new Paint(Paint.DITHER_FLAG);

		mPaint = new Paint();
		mPaint.setAntiAlias(true);
		mPaint.setDither(true);
		mPaint.setStyle(Paint.Style.STROKE);
		mPaint.setStrokeJoin(Paint.Join.ROUND);
		mPaint.setStrokeCap(Paint.Cap.ROUND);
		mPaint.setStrokeWidth(3);

	}

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		super.onSizeChanged(w, h, oldw, oldh);
		mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
		mCanvas = new Canvas(mBitmap);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
		canvas.drawPath(mPath, mPaint);
		for (PointsToPaint point : pointsList) {
			mPaint.setColor(point.color);
		}
	}

	private float mX, mY;

	private void touch_start(float x, float y) {
		mPath.reset();
		mPath.moveTo(x, y);
		mX = x;
		mY = y;
	}

	private void touch_move(float x, float y) {
		float dx = Math.abs(x - mX);
		float dy = Math.abs(y - mY);
		if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
			mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
			mX = x;
			mY = y;
		}
	}

	private void touch_up() {
		mPath.lineTo(mX, mY);
		mCanvas.drawPath(mPath, mPaint);
		mPath.reset();
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		float x = event.getX();
		float y = event.getY();
		pointsList.add(new PointsToPaint(color));

		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			touch_start(x, y);
			invalidate();
			break;
		case MotionEvent.ACTION_MOVE:
			touch_move(x, y);
			invalidate();
			break;
		case MotionEvent.ACTION_UP:
			touch_up();
			invalidate();
			break;
		}
		return true;
	}

	public void clear() {
		mBitmap.eraseColor(Color.TRANSPARENT);
		invalidate();
		System.gc();
	}

	@Override
	public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
	}

	@Override
	public void surfaceCreated(SurfaceHolder arg0) {
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder arg0) {
	}

	public void setColor(int color) {
		this.color = color;
	}
	

}
